U3825L datasheet(7/17 Pages) TI

7 / 17 page

7

UC1825

UC2825

UC3825

Forward Technique for Off-Line Voltage Mode Application

Constant Volt-Second Clamp Circuit

The circuit shown here will achieve a constant

volt-second product clamp over varying input voltages.

The ramp generator components, RT and CR are cho-

sen so that the ramp at Pin 9 crosses the 1V threshold

at the same time the desired maximum volt-second

product is reached. The delay through the functional

nor block must be such that the ramp capacitor can be

completely discharged during the minimum deadtime.

Output Section

Simplified Schematic

Rise/Fall Time (CL=1nF)

Rise/Fall Time (CL=10nF)

Saturation Curves

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